Identifier: streetrailwayjo281906newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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petticoatporcelain insulators with porcelain sleeves extending to the • Hifih Tension ij 6 Hard Drawn Copper Utri^et Railway JiumtaL SECTIONAL VIEW OF ROADBED, POLE AND FITTINGS throughout the length of the line.One of the accompanying drawingsshows the position of the several cir-cuits on the poles. Each of thepoles, which are 35 ft. long and havei2-in. butts, carries in addition tothe bracket three cross-arms. Thetwo upper arms near the top of thepole are reserved for high-tensionlines and the ground wires protect-ing these. The third cross-arm islocated just below the trolley armand carries the telephone lines and llie feeder, and space is also reserved for telegra))hlines. The trolley arni, as may be observed in thedrawing, consists of a piece of wood measuring ^AX 21/2 ins. X 9 ft. long. It is fastened to the poleby two braces which encircle half the pole and pre-vent the arm from being twisted sidewise. The outer endof the trolley arm is supported by a 5-16-in. galvanized iron
Text Appearing After Image:
J)ETA1J.S OF IOLE AND I.RACKET CONSTRUCTION cross-arms and intended for a 40,000-voIt line. Li the past,considerable trouble has lieen experienced from lightning. Toguard against this, the ground wires previously referred toare run on each end of the up;)er cross-arm. These consistof No. 6 iron wire and are grounded at every tenth pole bya lead which passes to the earth alongside the pole and ter-minates in a lo-ft. rod driven into the ground. The ground 286 STREET RAILWAY JOURNAL. (Vol. XXVIIL No. 8. wires are tied to the porcelain insulators supporting them insuch a manner that the ends of the tie wires or pig-tails aretwisted together and are pointed upward to serve as dis-charging points. The high-tension wires are tied withoutthis upward projecting end. Those poles at which the groundwires are run to the earth are termed special poles. One ofthe accompanying reproductions from a photograph showsone of these poles and the method of bringing the taps fromeach of the ground wires ov

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